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The 2015 Kia Optima offers three different audio setups for drivers to choose from. One option includes a navigation system, another features an Infinity Audio system, and the third has no special audio features. Despite the different configurations, the speaker sizes in the car remain consistent. You can expect to find a 4-inch center dash speaker, 3-1/2 inch corner dash speakers, 6-3/4 inch front door speakers, an 8-inch rear deck center speaker, and 6-3/4 inch rear door speakers. The advantage of these common speaker sizes is that they are easy to replace with aftermarket alternatives if you're interested. Audio enthusiasts will appreciate the potential for upgrading the Optima's head unit, but for a complete audio experience, an amplifier and subwoofer are essential additions. The Optima's spacious trunk offers plenty of room to install a subwoofer box for those who enjoy powerful bass.
The 2015 Kia Optima is equipped with 6.75-inch speakers in the front and rear doors. In addition, there are 3.5-inch speakers in the corner dash and 8-inch speakers in the back dash corners.
That is certainly not true for the 2015 Kia Optima EX with Infinity speakers and no navigation system. The speakers in all four doors are 6.5 inches, and I installed them according to the specifications.